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Finding the Fourth Proportional to 523.45, 781.39 and 485.45

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Solution

The fourth proportional to 523.45, 781.39 and 485.45 is: 724.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    523.45 : 781.39 = 485.45 : x
  2. Step 2: Convert to fraction form
    523.45/781.39 = 485.45/x
  3. Step 3: Cross multiply
    523.45x = 781.39 × 485.45
  4. Step 4: Simplify right side
    523.45x = 379,325.78
  5. Step 5: Solve for x
    x = 379,325.78/523.45
  6. Step 6: Final answer
    x = 724.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.